Two runners in a marathon determine that the angles of elevation of a news helicopter are 39.5 degrees and 42 degrees. if the helicopter is 1950 feet directly above the finish line how far apart are the runners?

For a given angle of elevation θ, the distance from the runner to the finish lline is
.. d = 1950×cot(θ)

The difference in distance to the finish line is the distance between runners, so that distance is
.. d₁ -d₂ = 1950×(cot(θ₁) -cot(θ₂)
.. = 1950×(cot(39.5°) -cot(42°))
.. ≈ 200 . . . . feet

The runners are about 200 feet apart.

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We need more info then that